单选题 The affluent middle class created by the Asian boom now {{U}}take up over from exports{{/U}} as the main engine of growth.

【正确答案】 D

【答案解析】[分析] 习惯搭配 take sth. as sth. (以某种方式)理解或解释某事：She took what he said as a compliment. 她把他的话看作是恭维话。the middle class是集合名词，后接动词的单数形式。